Built-in bayonet type sleeve fishing device and using method

Abstract

The invention relates to a built-in bayonet type casing pipe salvage device and a use method, a built-in bayonet type salvage rod is adopted for salvage of a casing pipe, the salvage rod comprises a salvage rod body and a clamping lug device, the salvage device can sink to the position of a casing pipe joint by means of the self weight of the salvage rod body, a gap at the position of the casing pipe joint is clamped by means of a telescopic alternating carbon steel clamping lug, and the sleeve pipe joint is salvaged. The larger the upward pulling force is, the tighter the clamping lugs are clamped, and therefore the purpose of quickly fishing the casing pipe is achieved. The built-in bayonet type sleeve salvage device is simple in structure, convenient to manufacture and high in efficiency, manpower and salvage cost can be greatly saved, the working efficiency of geotechnical engineering investigation is improved, and the built-in bayonet type sleeve salvage device plays a positive role in development of the geotechnical engineering investigation industry.

Description

Technical Field

[0001] The invention relates to the technical field of field drilling for geotechnical engineering investigation, and in particular to a built-in bayonet-type casing salvage device and a use method thereof. Background Art

[0002] In geotechnical engineering investigation, casing has the functions of preventing hole wall collapse and isolating leaking layers. It has been widely used in fill and gravel soil layer investigation. After the drilling field operation is completed, the casing should be recycled and reused. However, as the number of times the casing is used increases, the threads at the casing joints wear out, and safety accidents such as the casing falling into the borehole often occur.

[0003] The commonly used method now is to lower the casing to connect the casing dropped in the borehole or to use a steel casing plus a rotary drill to drill out the dropped casing. The current method is not only time-consuming and laborious, but also inefficient.

[0004] How to salvage the fallen casing conveniently, quickly and cost-effectively has become an urgent problem to be solved in geotechnical engineering survey. Researching an efficient casing salvage device will play a positive role in promoting the development of the geotechnical engineering survey industry. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the present invention provides a built-in bayonet type casing salvaging device and a use method thereof.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A built-in bayonet-type casing salvaging device, comprising: a salvaging device and a bayonet device;

[0008] The salvage device comprises a cone mouth, a salvage rod body and a male joint which are connected in sequence, the salvage rod body is provided with a clamping groove, and a first hinge point is provided in the clamping groove;

[0009] The ear device includes a cross-carbon steel ear arranged on the side of the salvage rod body, a spring, a second hinge point and two spring buckles. The cross-carbon steel ear is V-shaped, the second hinge point is arranged at the V-shaped end of the cross-carbon steel ear, and the two ends of the spring are respectively connected to the two sections of the cross-carbon steel ear through a spring buckle.

[0010] The ear device is installed in the slot in the fishing rod body through overlapping hinge points.

[0011] The fishing device is connected to the drill pipe to provide pulling force.

[0012] The salvaging device sinks to the casing joint and clamps the gap at the casing joint through the retractable cross-carbon steel clamp to salvage the casing.

[0013] A method for using a built-in bayonet casing salvage device comprises: the salvage device sinks by the deadweight of a salvage rod body, during the sinking process, the inner wall of the casing squeezes a cross-carbon steel clip, the cross-carbon steel clip contracts and squeezes a spring to make the salvage rod body sink inside the casing, and when it sinks to the joint of two sections of casing, the salvage rod body is lifted up, and the gap at the casing joint is clamped by the retractable cross-carbon steel clip, and an upward pulling force is provided by a drill pipe, and the greater the upward pulling force, the tighter the cross-carbon steel clip is clamped, so that the casing dropped in the borehole can be salvaged.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The built-in bayonet-type casing salvage device of the present invention is used for quickly and conveniently salvaging casing dropped in a borehole. The present invention adopts a built-in bayonet-type salvage rod to salvage casing, which mainly includes a salvage rod body and a clamping ear device. By utilizing the deadweight of the salvage rod body, the salvage device can sink to the position of the casing joint, and utilizes a retractable cross-carbon steel clamping ear to clamp the gap at the casing joint. The greater the upward pulling force, the tighter the clamping ear is, thereby achieving the purpose of quickly salvaging the casing. This device is not only simple in structure, easy to manufacture, and highly efficient, but also can greatly save manpower and salvage costs, improve the work efficiency of geotechnical engineering surveys, and has a positive effect on the development of the geotechnical engineering survey industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a schematic plan view of the present invention;

[0018] Figure 3 It is a side view schematic diagram of the present invention;

[0019] Figure 4 is a plan view of the card ear device;

[0020] Figure 5 It is a schematic diagram of the structure of the present invention when it is working;

[0021] Figure 6 It is a schematic cross-sectional view of the present invention during operation.

[0022] Among them, 1. cone mouth; 2. cross carbon steel ear; 3. spring; 4. fishing rod body; 5. male joint; 6. hinge point; 7. spring buckle; 8. slot; 9. drill pipe; 10. drill pipe joint; 11. casing; 12. casing female joint. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with specific implementation methods:

[0024] like Figure 1-6As shown, in this embodiment, a built-in bayonet-type casing salvage device includes: a salvage device and a bayonet device;

[0025] The salvage device comprises a cone mouth 1, a salvage rod body 4 and a male joint 5 which are connected in sequence, and a clamping groove 8 is provided on the salvage rod body 4;

[0026] The ear device includes a cross-carbon steel ear 2, a spring 3 and two spring buckles 7 arranged on the side of the salvage rod body. The cross-carbon steel ear 2 is V-shaped, and hinge points 6 are provided in the slot 8 and at the V-shaped end of the cross-carbon steel ear 2. The two ends of the spring 3 are respectively connected to the two ends of the cross-carbon steel ear 2 through a spring buckle 7.

[0027] The ear device is installed in the slot 8 in the fishing rod body 4 through the hinge point 6.

[0028] The fishing device in the present invention provides an upward pulling force by being connected to the drill pipe 9 .

[0029] The salvage device of the present invention sinks by the deadweight of the salvage rod body 4. During the sinking process, the inner wall of the casing 9 squeezes the cross-carbon steel ear 2, and the cross-carbon steel ear 2 contracts and squeezes the spring 3, so that the salvage rod body 4 sinks smoothly inside the casing 9. When it sinks to the joint of the two sections of the casing, the salvage rod body 4 is lifted up, and the retractable cross-carbon steel ear 2 is used to clamp the gap at the casing joint, and the drill pipe 9 is used to provide an upward pulling force. The greater the upward pulling force, the tighter the cross-carbon steel ear 2 is clamped, and the casing 11 dropped in the borehole can be quickly salvaged.

[0030] The invention has the advantages of simple structure, convenient manufacture and high efficiency, greatly saves manpower and salvage costs, improves the working efficiency of geotechnical engineering survey, and has a positive effect on the development of the geotechnical engineering survey industry.

[0031] This embodiment is only a further explanation of the invention rather than a limitation of the invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of the claims of the invention, they are protected by the patent law.

Claims

1. A built-in bayonet casing salvage device, characterized in that: include: Salvage and catching devices; The salvage device comprises a cone, a salvage rod body and a male joint which are connected in sequence, and a clamping groove is provided on the salvage rod body; The ear device includes a cross-carbon steel ear, a spring and two spring buckles arranged on the side of the salvage rod body. The cross-carbon steel ear is V-shaped, and hinge points are provided in the slot and at the V-shaped end of the cross-carbon steel ear. The two ends of the spring are respectively connected to the two ends of the cross-carbon steel ear through a spring buckle.

2. The internal bayonet casing salvage device according to claim 1, characterized in that: The ear device is installed in the slot in the fishing rod body through overlapping hinge points.

3. The internal bayonet casing salvage device according to claim 1, characterized in that: The fishing device is connected to the drill pipe to provide pulling force.

4. The internal bayonet casing salvage device according to claim 1, characterized in that: The salvaging device is sunk to the position of the casing joint, and the gap at the casing joint is clamped by the retractable cross-carbon steel clamp to salvage the casing.

5. The method for using the built-in bayonet casing salvage device according to claim 1, characterized in that: The method comprises: the salvage device sinks by the deadweight of the salvage rod body, during the sinking process, the inner wall of the casing squeezes the cross-carbon steel clip, the cross-carbon steel clip contracts and squeezes the spring to make the salvage rod body sink inside the casing, and when it sinks to the joint of two sections of casing, the salvage rod body is lifted up, and the retractable cross-carbon steel clip is used to clamp the gap at the casing joint, and the drill pipe is used to provide an upward pulling force, the greater the upward pulling force, the tighter the cross-carbon steel clip is clamped, and the casing dropped in the borehole is salvaged.

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